JP2021049662A - Manufacturing method of resin housing, manufacturing apparatus of resin housing, and resin housing - Google Patents

Abstract

To provide a manufacturing method, a manufacturing apparatus, and a resin housing that can suppress the sticking of the resin housing to a fixed mold.SOLUTION: A fixed mold 110 and a cavity C formed between a movable mold 120 and a first slide mold 130 form a case body 11. The first slide mold 130 molds an inner surface of a tip portion 19b of an inlet 19 and also molds a protruding portion 17d that protrudes from the case body toward a side where the first slide mold 130 leaves the inlet 19 along a slide direction of the first slide mold 130 at a position away from the inlet 19.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method for manufacturing a resin housing, an apparatus for manufacturing a resin housing, and a resin housing.

Patent Document 1 discloses an injection molding die used for molding a resin case. This injection molding mold has a fixed mold and a movable mold that can be moved with respect to the fixed mold, and in a state where both molds are molded, a case in which molten resin is injected into the cavities of both molds. Is to be molded. The movable type is provided with a slide core that can move in a direction different from the movable type opening direction. The fixed type is provided with an inclined cam having an inclined surface inclined with respect to the mold opening direction at a portion facing the slide core installation portion. The tilted cam is inserted into a cam hole provided through the slide core. When the movable mold is moved in the mold opening direction, the slide core is moved along the inclined surface of the inclined cam, so that the slide core can be moved in a direction different from the mold opening direction.

According to such an injection molding die, when the case is injection-molded, the slide core is used even when a protruding portion having a molding removal direction different from that of the case body is provided on the outer wall of the case body. By molding the protruding portion, the case can be molded.

Japanese Patent No. 3772410

By the way, in some of these resin cases, a large number of ribs are projected on the outer surface. In the manufacturing process of such a case, when the molten resin filled in the cavity of the mold is cooled and solidified, the volume shrinkage amount differs for each rib, so that the resin product easily sticks to the mold. Therefore, in a configuration in which such ribs are molded by a fixed mold, the case sticks to the fixed mold, which makes it difficult to remove the case from the fixed mold when opening the mold, which may deform the case.

It should be noted that such a problem is not limited to the resin housing in which a large number of ribs are projected on the outer surface, but commonly occurs in the resin housing having a shape that easily sticks to the fixed mold.

An object of the present invention is to provide a method for manufacturing a resin housing capable of suppressing sticking to a fixed mold, a device for manufacturing a resin housing, and a resin housing.

A method for manufacturing a resin housing for achieving the above object is a fixed type, a movable type, and a movable type together with the movable type, which can be moved with respect to the fixed type and slidable in a direction inclined with respect to the moving direction of the movable type. By injecting molten resin into the cavity formed between the slide molds provided in the housing body, a housing body having a main opening, a tubular portion projecting outward from the housing body and opening at the tip, and a tubular portion. A method of manufacturing a resin housing comprising the above, wherein the housing body is formed by a cavity formed between the fixed mold, the movable mold, and the slide mold, and the slide mold is used to form the tubular portion. At least the inner surface of the tip portion is molded, and at a position away from the cylinder portion, a protrusion protruding from the housing body is formed along the slide direction of the slide mold toward the side where the slide mold separates from the cylinder portion. To do.

According to this method, when the mold is opened, that is, when the movable mold is moved toward the side away from the fixed mold, the slide mold moves toward the side away from the fixed mold. At this time, in addition to the inner surface of at least the tip portion of the tubular portion of the housing, the slide type presses the protruding portion protruding from the housing body at a position away from the tubular portion toward the side away from the fixed mold. Therefore, a larger force acts on the housing toward the side away from the fixed mold. Therefore, it is possible to prevent the housing from sticking to the fixed mold. Since the protrusion protrudes from the housing body toward the side where the slide mold separates from the cylinder along the slide direction of the slide mold, the protrusion does not get in the way when the slide mold is pulled out from the housing.

An apparatus for manufacturing a resin housing for achieving the above object is movable with respect to the fixed type, the movable type, and the movable type, and slides in a direction inclined with respect to the moving direction of the movable type. From the housing body having a main opening and the housing body by injecting molten resin into a cavity formed between the fixed type, the movable type, and the slide type, which is provided with a slide type that is possibly provided. It is an apparatus for manufacturing a resin housing including a tubular portion that protrudes and opens at the tip. A cavity for molding the housing body is formed between the fixed mold, the movable mold, and the slide mold, and the slide mold has a molding convex portion for molding the inner surface of at least the tip portion of the tubular portion. It has a molding recess for molding a protrusion protruding from the housing body along the slide direction of the slide mold at a position away from the molding protrusion.

According to the same configuration, when the mold is opened, that is, when the movable mold is moved toward the side away from the fixed mold, the slide mold moves toward the side away from the fixed mold. At this time, the slide-type molding protrusion presses the inner surface of at least the tip of the housing cylinder toward the side away from the fixed mold, and the slide-type molding recess fixes the protrusion protruding from the housing body. Press toward the side away from the mold. Therefore, a larger force acts on the housing toward the side away from the fixed mold. Therefore, it is possible to prevent the housing from sticking to the fixed mold. Since the protrusion protrudes from the housing body toward the side where the slide mold separates from the cylinder along the slide direction of the slide mold, the protrusion does not get in the way when the slide mold is pulled out from the housing.

The resin housing for achieving the above object includes a housing main body having a main opening, and a tubular portion that protrudes outward from the housing main body and opens at the tip end. At least the tip of the cylinder extends so as to be inclined in a direction orthogonal to the opening surface of the main opening, and the portion of the housing body away from the cylinder is the tip of the cylinder. A protrusion is provided that protrudes toward the tip end side of the tubular portion along the axial direction.

According to the same configuration, it is possible to obtain the same action and effect as the above-mentioned action and effect.

According to the present invention, it is possible to suppress sticking of the resin housing to the fixed mold.

The perspective view which shows the air cleaner in one Embodiment. The exploded perspective view which shows the air cleaner of the same embodiment. The perspective view which shows the case of the same embodiment. Sectional drawing which shows the mold which manufactures a case. It is a figure explaining the manufacturing process of the case of the same embodiment, and is the cross-sectional view which shows the state which the molten resin is injected into the cavity. It is a figure which shows the manufacturing process, and is the cross-sectional view which shows the state which the movable type and each slide type have moved to the side away from the fixed type. It is a figure which shows the manufacturing process, and is the cross-sectional view which shows the state which the 1st slide type was taken out from a case. It is a figure which shows the manufacturing process, and is the cross-sectional view which shows the state which the case is extruded from the movable mold.

Hereinafter, one embodiment will be described with reference to FIGS. 1 to 8.
As shown in FIG. 1, an air cleaner for purifying the intake air is provided in the intake passage of the in-vehicle internal combustion engine.

As shown in FIGS. 1 and 2, the air cleaner includes a case 10 having an inlet 19, a cap 20 having an outlet 29, and a filter element 30 having a filtration unit 31. Both the case 10 and the cap 20 are made of a hard resin material. The case 10 corresponds to the resin housing according to the present invention.

<Case 10>
As shown in FIG. 3, the case 10 has a case main body 11 having a peripheral wall 12 surrounding the opening 13 and a bottom wall 14 facing the opening 13, and the case 10 projects outward from the peripheral wall 12 and opens at the tip. It has an inlet 19. A plurality of ribs (not shown) are projected on the outer surface of the bottom wall 14.

The opening 13 corresponds to the main opening according to the present invention, the case body 11 corresponds to the housing body according to the present invention, and the inlet 19 corresponds to the tubular portion according to the present invention. Further, hereinafter, the extending direction of the peripheral edge of the opening 13 will be described as the circumferential direction X.

Inside the case body 11, a partition wall 15 for partitioning the opening 13 into a first opening 13A and a second opening 13B is provided. The partition wall 15 is connected to the inner surfaces of the peripheral wall 12 and the bottom wall 14.

A flange 12a is provided on the periphery of the opening 13 in the peripheral wall 12 over the entire circumference. The end surface of the partition wall 15 is a sealing surface 15a flush with the flange 12a.
A pair of mounting portions 11a for mounting the case 10 to the vehicle are projected on a part of the outer surface of the peripheral wall 12 at intervals in the circumferential direction X.

A pair of gate-shaped support portions 11b are projected from a part of the outer surface of the peripheral wall 12 in the circumferential direction X at intervals from each other. Each support portion 11b is provided on the opposite side of the pair of mounting portions 11a with a partition wall 15 interposed therebetween.

The inlet 19 has a base end portion 19a protruding outward from a portion of the peripheral wall 12 surrounding the first opening 13A, and a tubular tip portion 19b. The tip portion 19b extends so as to be closer to the cap 20 toward the tip side in a direction orthogonal to the opening surface 13a of the case 10 (hereinafter, orthogonal direction Z).

A first hooked portion 16A and a second hooked portion 16B are provided so as to project from the outer surface of the peripheral wall 12 that surrounds the second opening 13B. The first hooking portion 16A is provided on the outer surface of the peripheral wall 12 where the inlet 19 is projected. The second hooked portion 16B is provided on the outer surface opposite to the first hooked portion 16A with the second opening 13B interposed therebetween.

Both ends of the hooked portions 16A and 16B in the circumferential direction X are connected to a pair of support walls 17a and 17b protruding from the outer surface of the peripheral wall 12 and extending along the orthogonal direction Z. Further, the ends of the support walls 17a and 17b on the opening 13 side are connected to each other by a connecting wall 17c protruding from the outer surface of the peripheral wall 12.

The outer surface of the peripheral wall 12 on which the inlet 19 is provided is provided with a protruding portion 18 that projects toward the outer peripheral side and bends toward the bottom wall 14. The protruding portion 18 extends along the circumferential direction X and is connected to the base end portion 19a of the inlet 19 (see FIG. 6). A plurality of ribs 18a are provided on the inner surface of the projecting portion 18 at intervals in the circumferential direction. Each rib 18a is connected to the outer surface of the peripheral wall 12. In the present embodiment, one of the plurality of ribs 18a has a function as a support wall 17a for supporting the first hooking portion 16A.

The support wall 17b is provided with a protrusion 17d that projects toward the tip 19b side of the inlet 19 along the axial direction Y of the tip 19b of the inlet 19. That is, the protrusion 17d is provided at a portion of the case body 11 away from the inlet 19. The protrusion 17d is provided over the entire projecting direction of the support wall 17b.

<Cap 20>
As shown in FIGS. 1 and 2, the cap 20 has a peripheral wall 22 surrounding an opening (not shown), a cap main body 21 having a top wall 23 facing the opening, and protruding outward from the peripheral wall 22. It is provided with an outlet 29 that opens at the tip.

The cap body 21 is provided with a partition frame 24 for partitioning the opening into two first openings and second openings (both not shown) facing the first opening 13A and the second opening 13B of the case 10, respectively. There is.

A support portion 25 is provided so as to project from a portion corresponding to each of the hooked portions 16A and 16B on the outer surface of the peripheral wall 22. A clamp (not shown) is tiltably supported on each support portion 25. The case 10 and the cap 20 are fastened by hooking each clamp to the hooked portions 16A and 16B.

A flange (not shown) is provided on the periphery of the opening in the peripheral wall 22 over the entire circumference. The end surface of the partition frame 24 is a sealing surface (not shown) flush with the flange.
A pair of protrusions 21b inserted into each support portion 11b of the case 10 is provided on a part of the outer surface of the peripheral wall 22. The pair of support portions 11b and the pair of protrusions 21b also function as hinges that slantably support the cap 20 with respect to the case 10.

<Filter element 30>
As shown in FIG. 2, the filter element 30 has a filtration unit 31 and a seal portion 32 provided over the entire circumference of the peripheral edge of the filtration unit 31. The filtration unit 31 is formed by folding a non-woven fabric. In the present embodiment, the filtration portion 31 and the seal portion 32 are integrally formed of the non-woven fabric.

A B-shaped gasket (not shown) in a plan view is provided between the flange 12a and the sealing surface 15a of the case 10 and the flange and the sealing surface of the cap 20.
The seal portion 32 of the filter element 30 is supported over the entire circumference by a portion of the gasket that surrounds the first opening 13A, so that the case 10 and the cap 20 and the seal portion 32 are sealed. Further, the portion of the gasket that surrounds the second opening 13B seals between the case 10 and the cap 20.

In such an air cleaner, the air sucked through the inlet 19 by the suction operation of the internal combustion engine circulates in this order in the space on the first opening 13A side of the case 10, the filter element 30, and the internal space of the cap 20, and is derived from the outlet 29. Is supplied to the combustion chamber of the internal combustion engine. Also, the air is filtered as it passes through the filter element 30.

Next, the configuration of the manufacturing apparatus for manufacturing the case 10 will be described with reference to FIG.
As shown in FIG. 4, the manufacturing apparatus includes a mold 100. Note that FIG. 4 shows the cross-sectional structure of the mold 100 along both the axial direction Y and the orthogonal direction Z of the inlet 19.

The mold 100 includes a fixed mold 110 and a movable mold 120 provided so as to be close to and separated from the fixed mold 110.
The fixed mold 110 has a molding surface 111 for molding a portion on the outer surface side of the case 10.

The movable mold 120 has a molding surface 121 for molding a portion on the inner surface side of the case 10.
The mold 100 includes a first slide mold 130 and a second slide mold 140 that can be moved with respect to the fixed mold 110 together with the movable mold 120.

The first slide type 130 is provided so as to be slidable in a direction inclined with respect to the moving direction of the movable type 120.
The first slide mold 130 is provided so as to be fitable in the fitting recess 122 formed in the movable mold 120, and has a base 131 having a molding surface 132 for forming a portion on the inner surface side of the case 10, and a tip portion in the inlet 19. It has a molding convex portion 133 for molding the inner surface of 19b.

The first slide mold 130 has a molding surface 135 for molding a part of the connecting wall 17c and the outer surface of the support wall 17b, and a molding portion 134 having a molding recess 136 for molding the protrusion 17d. The molding recess 136 extends along the slide direction of the first slide mold 130, that is, the axial direction Y of the inlet 19 at a position away from the molding protrusion 133. In the present embodiment, the molded portion 134 is formed separately from the base portion 131 and is fixed to the base portion 131.

The second slide type 140 is provided so as to be slidable in a direction orthogonal to the moving direction of the movable type 120. The second slide type 140 has a molding convex portion 141 for forming the inner surface of the base end portion 19a at the inlet 19.

Next, a method of manufacturing the case 10 will be described with reference to FIGS. 5 to 8.
First, as shown in FIG. 5, in a state where the fixed mold 110, the movable mold 120, and the slide mold 130, 140 are molded, the molding surfaces 111, 121, 132, 135, and the molding convex portions 133, 141 The molten resin is injected into the cavity C formed between the two. As a result, the case body 11 and the inlet 19 are molded. At this time, the protrusion 17d is formed by the molding recess 136 of the molding portion 134.

Next, as shown in FIG. 6, the first slide type 130 and the second slide type 140 are separated from the fixed type 110 together with the movable type 120. At this time, the molding convex portion 133 of the first slide mold 130 presses the inner surface of the tip portion 19b of the inlet 19 toward the side away from the fixed mold 110, and the molding convex portion 141 of the second slide mold 140 presses the inner surface of the inlet 19. The inner surface of the base end portion 19a is pressed toward the side away from the fixed mold 110. Further, the molding recess 136 of the molding portion 134 presses the protrusion 17d toward the side away from the fixed mold 110. As a result, the case 10 is separated from the fixed type 110 together with the movable type 120, the first slide type 130, and the second slide type 140.

Next, as shown in FIG. 7, the first slide type 130 is pulled out from the case 10. That is, the first slide type 130 is extracted from the inlet 19 along the slide direction of the first slide type 130, that is, along the axial direction Y of the tip portion 19b of the inlet 19.

Next, as shown in FIG. 8, the second slide mold 140 is pulled out from the case 10, and the case 10 is pushed out from the movable mold 120 by an extrusion pin (not shown).
Next, the operation of this embodiment will be described.

When the mold is opened, that is, when the movable mold 120 is moved toward the side away from the fixed mold 110, the first slide mold 130 moves toward the side away from the fixed mold 110. At this time, in the first slide type 130, in addition to the inner surface of the tip portion 19b of the inlet 19 of the case 10, the protrusion 17d protruding from the case body 11 at a position away from the inlet 19 is directed toward the side away from the fixed type 110. Press. Therefore, a larger force acts on the case 10 toward the side away from the fixed mold 110.

Next, the effect of this embodiment will be described.
(1) The case body 11 is formed by the cavity C formed between the fixed mold 110 and the movable mold 120 and the first slide mold 130. Further, the inner surface of the tip portion 19b of the inlet 19 is formed by the first slide type 130, and the first slide type 130 is separated from the inlet 19 along the slide direction of the first slide type 130 at a position away from the inlet 19. A protrusion 17d protruding from the case body 11 toward the side is formed.

According to such a configuration, since the above-mentioned action is exhibited, it is possible to prevent the case 10 from sticking to the fixed mold 110. Since the protrusion 17d protrudes from the case body 11 toward the side where the first slide type 130 is separated from the inlet 19 along the slide direction of the first slide type 130, the first slide type 130 is moved from the case 10. The protrusion 17d does not get in the way when pulling out.

(2) A cavity C for molding the case body 11 is formed between the fixed mold 110, the movable mold 120, and the first slide mold 130. The first slide mold 130 projects from the case body 11 along the slide direction of the first slide mold 130 at a position away from the molding convex portion 133 that forms the inner surface of the tip portion 19b of the inlet 19 and the molding convex portion 133. It has a molding recess 136 for molding the protrusion 17d.

According to such a configuration, the above effect (1) can be achieved.
(3) The molding concave portion 136 is formed separately from the molding convex portion 133.
According to such a configuration, the molding recess 136 for molding the protrusion 17d is formed separately from the molding protrusion 133 for molding the inner surface of the tip 19b of the inlet 19. Therefore, the molding recess 136 and the molding convex portion 133 can be easily formed as compared with the case where the molding concave portion 136 and the molding convex portion 133 are integrally formed. Therefore, the entire first slide type 130 can be easily formed.

(4) The case 10 includes a case main body 11 having an opening 13 and an inlet 19 that protrudes outward from the case main body 11 and opens at the tip. The tip 19b of the inlet 19 extends at an angle with respect to the direction Z orthogonal to the opening surface 13a of the opening 13, and the axis of the tip 19b of the inlet 19 is located at a portion of the case body 11 away from the inlet 19. A protrusion 17d is provided that projects toward the tip end side of the inlet 19 along the direction Y.

According to such a configuration, the above effect (1) can be achieved.
Further, according to the above configuration, the rigidity of the support wall 17b supporting the first hooked portion 16A is increased by the protrusion 17d, so that the rigidity of the first hooked portion 16A is improved.

<Change example>
This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

A protrusion 17d may be provided on a support wall that supports the second hooking portion 16B.
The protrusion 17d may be provided so as to project from the outer surface of the peripheral wall 12.

-The resin housing according to the present invention is not limited to the case 10, and the present invention may be applied to the cap 20.
-The resin housing according to the present invention is not limited to the case 10 and the cap 20 of the air cleaner, and the present invention can also be applied to other resin housings such as an intake manifold.

The molding portion 134 having the molding concave portion 136 may be formed integrally with the molding convex portion 133.

10 ... case, 11 ... case body, 11a ... mounting part, 11b ... support part, 12 ... peripheral wall, 12a ... flange, 13 ... opening, 13A ... first opening, 13B ... second opening, 13a ... opening surface, 14 ... Bottom wall, 15 ... Partition wall, 15a ... Sealing surface, 16A ... First hooked portion, 16B ... Second hooked portion, 17a, 17b ... Support wall, 17c ... Connecting wall, 17d ... Protrusion, 18 ... Projection, 19 ... inlet, 19a ... base end, 19b ... tip, 20 ... cap, 21 ... cap body, 22 ... peripheral wall, 23 ... top wall, 24 ... partition frame, 25 ... support, 29 ... outlet, 30 ... Filter element, 31 ... Filter part, 32 ... Flange part, 100 ... Mold, 110 ... Fixed mold, 111 ... Molding surface, 120 ... Movable mold, 121 ... Molding surface, 122 ... Fitting recess, 130 ... First Slide mold, 131 ... Base, 132 ... Molding surface, 133 ... Molding convex part, 134 ... Molding part, 135 ... Molding surface, 136 ... Molding recess, 140 ... Second slide mold, 141 ... Molding convex part, X ... Circumferential direction , Y ... Axial direction, Z ... Orthogonal direction, C ... Cavity.

Claims (4)

Melted into a cavity formed between a fixed mold, a movable mold, and a slide mold provided together with the movable mold so as to be movable with respect to the fixed mold and slidable in a direction inclined with respect to the moving direction of the movable mold. A method of manufacturing a resin housing including a housing body having a main opening and a tubular portion that protrudes outward from the housing body and opens at the tip by injecting resin.
The housing body is formed by a cavity formed between the fixed mold and the movable mold and the slide mold.
The slide mold forms the inner surface of at least the tip portion of the tubular portion, and at a position away from the tubular portion, the slide mold is directed toward the side away from the tubular portion along the slide direction of the slide mold. Mold the protrusion protruding from the housing body,
How to manufacture a resin housing. A fixed type, a movable type, and a slide type provided so as to be movable with respect to the fixed type together with the movable type and slidable in a direction inclined with respect to the moving direction of the movable type, and the fixed type and the movable type are provided. A resin housing including a housing body having a main opening by injecting molten resin into a cavity formed between the mold and the slide mold, and a tubular portion protruding from the housing body and opening at the tip. It is a device that manufactures
A cavity for molding the housing body is formed between the fixed mold and the movable mold and the slide mold.
The slide mold forms a molded convex portion that forms the inner surface of at least the tip portion of the tubular portion, and a protrusion that protrudes from the housing body along the slide direction of the slide mold at a position away from the molded convex portion. With a molding recess,
Manufacturing equipment for resin housings. The molding recess is formed separately from the molding protrusion.
The resin housing manufacturing apparatus according to claim 2. A resin housing including a housing body having a main opening and a tubular portion that projects outward from the housing body and opens at the tip.
At least the tip of the cylinder extends at an angle with respect to the direction orthogonal to the opening surface of the main opening.
A protrusion of the housing body that is separated from the tubular portion is provided with a protrusion that projects toward the distal end side of the tubular portion along the axial direction of the distal end portion of the tubular portion.
Resin housing.

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